body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center
}

#root {
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  display: flex;
  width: 910px
}


button {
  margin: 20px;
  padding: 10px;
  font-size: 20px;
  background: none;
  border: none;
  cursor: pointer;
  outline: none;
  border: 1px solid lightgrey;
  border-radius: 3px;
  color: grey;
  transition: color .3s, box-shadow .3s
}

button:hover {
  box-shadow: 1px 1px 5px lightgrey;
  color: #333
}